ML083420081

IP SEIS Reference - 2000 Year Class Appendix F - Summary of Atlantic Tomcod Food Habits Study

ML083420081
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Site:	Indian Point
Issue date:	04/30/2003
From:	ASA Analysis & Communication
To:	Dynegy Roseton, Entergy Nuclear Indian Point 2, Entergy Nuclear Indian Point 3, Mirant Bowline, Office of Nuclear Reactor Regulation
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Appendix F Summary of Atlantic Tomcod Food Habits Study

APPENDIX F CONTENTS

1. STUDY OBJECTIVE .................................................................................................... F-1

2. METHODS ................................................................................................................... F-1

3. RESULTS ..................................................................................................................... F-1 LIST OF FIGURES Number Title F-1 Monthly and regional percent composition (by weight) of major food items from Atlantic tomcod food habit study, 2000.

F-2 Percent composition (by weight) of major food items by length category of Atlantic tomcod from food habit study, 2000.

F-3 Percent composition (by weight) of major food items by length category and region from Atlantic tomcod food habit study, 2000.

LIST OF TABLES Number Title F-1 Number of stomachs analyzed for Atlantic tomcod food habit study, 2000.

F-2 Length frequency distribution of Atlantic tomcod analyzed for food habit study, 2000.

F-3 Total weight, count, and percent composition of food items from Atlantic tomcod food habit study, 2000.

F-4 Summary of food items from Atlantic tomcod food habit study by month and region, 2000.

2000 Year Class Report

F.1 STUDY OBJECTIVE The objective of the Atlantic tomcod food habits study was to examine the stomach contents of juvenile and adult Atlantic tomcod in order to detect differences in food habits throughout the Hudson River estuary and the possibility of cannibalism among Atlantic tomcod.

F.2 METHODS A maximum of 100 juvenile and 25 adult Atlantic tomcod per river run were collected during the Fall Shoals Survey. Up to 20 juvenile and 5 adult fish per river region (as defined below for the Atlantic tomcod food habits study) were preserved in 10 percent formalin and returned to the laboratory for analysis.

Atlantic Tomcod Food Habits River Regions LRS Region Region River Miles Designations 21 0-23 BT, YK 22 24-38 TZ, CH 23 39-46 IP 24 47-76 WP, CW, PK 25 77-152 HP, KG, SG, CS, AL In the laboratory, the entire stomach was removed from the fish and the contents carefully placed into a dissecting pan or petri dish. The contents were identified to family level for fish and to order for invertebrates, except for gammarid amphipods which were identified to family if possible. For each type of food item, a count and weight to the nearest hundredth gram were recorded on the laboratory data sheet. Other recorded information included sample number, region, and river run as well as fish length and life stage. Age, sex, and sexual condition were determined on Atlantic tomcod from river runs 9 through 11 only.

F.3 RESULTS A total of 998 Atlantic tomcod stomachs, 944 from juvenile fish and 54 from adult fish, were analyzed in 2000 (Table F-1). Fish were captured from all of the 13 designated regions of the Hudson River estuary from July through November 2000, with 50 percent of the juveniles caught during the summer and all of the adults captured in October and November. They were distributed fairly uniformly throughout the Hudson River except fewer fish were collected from the upper regions of Catskill and Albany and twice as many fish came from the Indian Point region as from other regions. Of the fish analyzed, 50 percent measured 100 mm or less with the smaller fish found mainly in the middle estuary and the larger fish throughout the estuary (Table F-2).

The most abundant food item by weight found in juvenile Atlantic tomcod was gammarid amphipods (Gammarus), comprising 50 percent of the total weight of all food items found in this age group (Table F-3). The other food items that made up 95 percent of the juvenile Atlantic tomcod diet were sand shrimp (Crangon), mysids (Neomysis), unidentified amphipods, and isopods. In adult Atlantic tomcod, the three food items that comprised over 95 percent by weight of the diet were sand shrimp (55 percent), grass shrimp (Palaemonetes pugio) (25 percent), and gammarid amphipods (18 percent). Several fish taxa from the goby, drum, and bass families were found in the stomachs of the analyzed Atlantic tomcod. A complete listing of all food items by month and region for both age groups is presented in Table F-4.

2000 Year Class Report

Consumption of the two major food items, Crangon and Gammarus, for both age groups were compared by month (Figure F-1, top graph), by region (Figure F-1, bottom graph), and by length (Figure F-2). Both major food items were consumed in about equal amounts from July to November. Crangon was the dominant food item in the lower estuary regions, but Gammarus dominated from West Point and above. Atlantic tomcod of all sizes consumed about equal proportions of Crangon and Gammarus except the smallest fish (under 70 mm) which fed on Neomysis and other food items. The largest fish (over 150 mm) also consumed P. pugio.

To ascertain whether fish size or location was more important in determining patterns in diet, a comparison of food items from the eight lower regions of the estuary investigated changes with region and length (Figure F-3). In the Battery through Tappan Zee regions, Crangon was preferred by all sizes of fish indicating that location may determine diet patterns in the lower estuary. In the middle portion of the estuary (Croton-Haverstraw and Indian Point), Crangon was still the preferred food source for fish over 120 mm, but smaller fish consumed a variety of food. In these regions, fish size may be more important in determining diet patterns. However, in the upper estuary (West Point and above), location may again become the determining factor as evidenced by the consumption of Gammarus almost exclusively.

2000 Year Class Report

Percent Composition of Food Items by Month 100 80 Percent Composition (by weight) 60 40 20 0

July August September October November December Percent Composition of Food Items by Region 100 80 Percent Composition (by weight) 60 40 20 0

BT YK TZ CH IP WP CW PK HP KG SG CS AL Region Legend:

Crangon P. pugio Gammarus Neomysis All Others Figure F-1. Monthly and regional percent composition (by weight) of major food items from Atlantic tomcod food habit study, 2000.

Percent Composition of Food Items by Fish Length Category 100%

90%

80%

70%

Percent Composition (by weight) 60%

50%

40%

30%

20%

10%

0%

<=70 71-80 81-90 91-100 101-110 111-120 121-130 131-140 141-150 >150 Length (mm)

Legend:

Crangon P. pugio Gammarus Neomysis All Others Figure F-2. Percent composition (by weight) of major food items by length category of Atlantic tomcod from food habit study, 2000.

Battery Yonkers 100 100 80 80 60 60 40 40 20 20 0 0

<=90 91-120 121-150 >150 <=90 91-120 121-150 >150 Tappan Zee Croton-Haverstraw 100 100 80 80 60 60 40 40 Percent Composition (by weight 20 20 0 0

<=90 91-120 121-150 >150 <=90 91-120 121-150 >150 Indian Point West Point 100 100 80 80 60 60 40 40 20 20 0 0

<=90 91-120 121-150 >150 <=90 91-120 121-150 >150 Cornwall Poughkeepsie 100 100 80 80 60 60 40 40 20 20 0 0

<=90 91-120 121-150 >150 <=90 91-120 121-150 >150 Length Category (mm)

Legend: Crangon P. pugio Gammarus Neomysis All Others Figure F-3. Percent composition (by weight) of major food items by length category and region from Atlantic tomcod food habit study, 2000.

TABLE F-1 NUMBER OF STOMACHS ANALYZED FOR ATLANTIC TOMCOD FOOD HABIT STUDY, 2000 July August September October November December Total Juvenile Battery 38 18 14 2 -- -- 72 Yonkers 38 12 20 14 1 -- 85 Tappan Zee 18 20 9 14 9 -- 70 Croton-21 35 17 12 11 -- 96 Haverstraw Indian Point 35 61 39 41 23 -- 199 West Point 11 16 24 5 5 -- 61 Cornwall 25 28 20 13 6 -- 92 Poughkeepsie -- 15 -- 23 36 -- 74 Hyde Park 21 32 19 1 5 -- 78 Kingston -- 17 7 9 6 -- 39 Saugerties -- 13 11 17 20 -- 61 Catskill -- -- 3 11 -- -- 14 Albany -- -- -- 3 -- -- 3 Total 207 267 183 165 122 0 944 Adult Battery -- -- -- 2 10 -- 12 Yonkers -- -- -- 5 4 -- 9 Tappan Zee -- -- -- -- 3 -- 3 Croton-

-- -- -- -- 4 -- 4 Haverstraw Indian Point -- -- -- 1 10 -- 11 West Point -- -- -- -- 2 -- 2 Cornwall -- -- -- -- 1 -- 1 Poughkeepsie -- -- -- -- 1 -- 1 Hyde Park -- -- -- 1 -- -- 1 Kingston -- -- -- -- 5 -- 5 Saugerties -- -- -- -- 5 -- 5 Catskill -- -- -- -- -- -- --

Albany -- -- -- -- -- -- --

Total 0 0 0 9 45 0 54

-- = None analyzed 2000 Year Class Report

TABLE F-2 LENGTH FREQUENCY DISTRIBUTION OF ATLANTIC TOMCOD ANALYZED FOR FOOD HABIT STUDY, 2000 Length Category (mm)

<=70 71-80 81-90 91-100 101-110 111-120 121-130 131-140 141-150 >150 Battery 1 1 10 19 20 14 5 2 -- 12 Yonkers -- 3 19 27 11 8 6 5 6 9 Tappan Zee -- 4 18 19 12 4 6 3 3 4 Croton-Haverstraw 3 17 34 14 9 5 5 4 2 7 Indian Point -- 12 46 60 45 16 10 9 1 11 West Point -- 2 24 17 8 7 2 -- 1 2 Cornwall -- 6 29 32 12 5 3 2 1 3 Poughkeepsie -- -- 6 9 7 12 14 16 9 2 Hyde Park -- 2 22 26 15 7 -- 2 3 2 Kingston -- -- 4 6 8 11 3 2 2 8 Saugerties -- -- -- 2 11 14 6 11 9 13 Catskill -- -- 1 -- 2 1 4 5 1 --

Albany -- -- -- -- -- 1 -- 1 -- 1 Total 4 47 213 231 160 105 64 62 38 74

-- = None collected 2000 Year Class Report

TABLE F-3 TOTAL WEIGHT, COUNT, AND PERCENT COMPOSITION OF FOOD ITEMS FROM ATLANTIC TOMCOD FOOD HABIT STUDY, 2000 Percent of Percent of Weight Total Total Class Order Genus or Family Species (g)a Weight Count Count Juvenile Atlantic tomcod Malacostraca Amphipoda Gammarus 54.93 49.85 12,734 67.98 Malacostraca Decapoda Crangon 37.79 34.30 439 2.34 Malacostraca Mysida Neomysis 5.72 5.19 1,371 7.32 Malacostraca Amphipoda 4.33 3.93 3,286 17.54 Malacostraca Isopoda 2.23 2.02 304 1.62 Malacostraca Decapoda Palaemonetes pugio 1.82 1.65 43 0.23 Malacostraca Decapoda 0.80 0.73 75 0.40 Unid. fish 0.56 0.51 14 0.07 Osteichthyes Perciformes Micropogonias undulatus 0.51 0.46 6 0.03 Polychaeta 0.29 0.26 16 0.09 Osteichthyes Perciformes Gobiidae 0.22 0.2 1 0.01 Osteichthyes Perciformes Sciaenidae 0.20 0.18 4 0.02 Malacostraca Decapoda Callinectes sapidus 0.15 0.14 6 0.03 Malacostraca Decapoda Rhithropanopeus harrisii 0.15 0.14 3 0.02 Oligochaeta 0.11 0.1 3 0.02 Malacostraca Isopoda Lironeca ovalis 0.08 0.07 17 0.09 Pelecypoda 0.05 0.05 50 0.27 Malacostraca Cumacea 0.05 0.05 25 0.13 Insecta Diptera Chironomidae (Larvae) 0.04 0.04 145 0.77 Insecta Trichoptera 0.04 0.04 3 0.02 Fish scales 0.04 0.04 31 0.17 Osteichthyes Perciformes Morone spp. 0.03 0.03 1 0.01 Insecta Trichoptera Leptoceridae (Juvenile) 0.02 0.02 1 0.01 Insecta Diptera Chironomidae (Pupae) 0.01 0.01 10 0.05 Maxillipoda Copepoda 0.01 0.01 72 0.38 Empty stomach < min -- 25 0.13 Gastropoda < min -- 11 0.06 Insecta Diptera (Pupae) < min -- 4 0.02 Insecta Diptera < min -- 22 0.12 Branchiopoda Diplostraca Cladocera < min -- 9 0.05 Total 110.18 100 18,731 100 Adult Atlantic tomcod Malacostraca Decapoda Crangon 23.33 53.98 103 6.67 Malacostraca Decapoda Palaemonetes pugio 10.60 24.53 20 1.3 Malacostraca Amphipoda Gammarus 7.75 17.93 1,359 88.02 Malacostraca Decapoda 0.58 1.34 15 0.97 Malacostraca Decapoda Callinectes sapidus 0.39 0.90 3 0.19 Osteichthyes Perciformes Gobiidae 0.16 0.37 1 0.06 Osteichthyes Perciformes Micropogonias undulatus 0.14 0.32 1 0.06 Malacostraca Mysida Neomysis 0.13 0.30 19 1.23 Malacostraca Isopoda 0.08 0.19 9 0.58 Unid. fish 0.06 0.14 1 0.06 Insecta Diptera Chironomidae (Larvae) < min -- 5 0.32 Insecta < min -- 1 0.06 Malacostraca Amphipoda < min -- 6 0.39 Empty stomach < min -- 1 0.06 Total 43.22 100 1,544 100 a

For some food items, weights were less than the minimum weight measurable by instrumentation and are represented here as < min.

2000 Year Class Report

TABLE F-4

SUMMARY

OF FOOD ITEMS FROM ATLANTIC TOMCOD FOOD HABIT STUDY BY MONTH AND REGION, 2000 Croton-Battery Yonkers Tappan Zee Indian Point West Point Cornwall Poughkeepsie Hyde Park Kingston Saugerties Catskill Albany Haverstraw Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt.

July Empty stomach 2 1 1 Morone spp. 1 0.03 Unid. fish 1 0.01 1 0.02 1 0.02 Pelecypoda 5 <min 10 <min Gastropoda 1 <min 6 <min Chironomidae 4 <min 3 <min 15 <min 14 <min Crangon 73 3.72 25 1.2 10 0.22 3 0.2 Palaemonetes pugio 6 0.23 10 0.09 1 0.02 Decapoda 5 0.03 10 0.07 3 0.01 Gammarus 6 0.02 6 0.01 208 0.79 99 0.39 332 0.72 425 0.81 Lironeca ovalis 17 0.08 Cumacea 5 <min Neomysis 331 1.07 139 0.7 48 0.19 132 0.6 328 1.24 Isopoda 2 <min 2 0.03 1 0.02 7 0.04 1 <min 35 0.27 2 0.01 Amphipoda 8 <min 29 0.01 44 0.05 13 0.01 99 0.09 11 <min 17 <min Copepoda 2 <min 3 <min 1 <min 14 <min 2 <min Cladocera 1 <min Fish scales 2 <min August Empty stomach 1 1 2 1 1 1 3 5 1.

Unid. fish 1 0.01 Pelecypoda 2 0.01 5 0.02 1 <min 10 <min Chironomidae (Larvae) 4 <min 6 <min 1 <min 8 <min 13 <min 2 <min 11 <min Chironomidae (Pupae) 1 <min 2 <min 7 0.01 Leptoceridae (Juvenile) 1 0.02 Diptera (Pupae) 1 <min Diptera 4 <min Crangon 40 2.71 12 1.05 20 0.82 2 0.06 4 0.35 Palaemonetes pugio 1 0.1 6 0.23 2 0.45 13 0.25 Decapoda 6 0.07 8 0.18 1 0.02 4 0.05 Gammarus 20 0.16 2 0.01 30 0.06 81 0.4 98 0.42 267 1.18 109 0.48 534 1.35 362 1.07 314 1.21 Cumacea 1 <min 4 0.01 Neomysis 25 0.15 4 0.03 3 <min 22 0.06 29 0.08 Isopoda 5 0.03 4 0.06 7 0.06 36 0.14 7 0.03 2 <min 3 <min 5 0.03 Amphipoda 1 <min 54 0.08 116 0.15 230 0.33 619 0.6 3 <min 28 0.01 NOTE: All weights are in grams. For some food items, weights were less than the minimum weight measurable by instrumentation and are represented here as < min.

TABLE F-4 (CONTINUED)

Croton-Battery Yonkers Tappan Zee Indian Point West Point Cornwall Poughkeepsie Hyde Park Kingston Saugerties Catskill Albany Haverstraw Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt.

August (cont.)

Copepoda 1 <min 6 <min 8 <min 16 <min Cladocera 7 <min 1 <min Oligochaeta 1 <min Polychaeta 1 <min 1 <min 1 0.01 2 0.01 Fish scales 1 <min 3 <min 4 <min 13 <min 1 <min 1 <min 2 <min September Empty stomach 1 2 1 Unid. fish 1 0.02 Pelecypoda 1 <min 1 <min 3 <min 1 <min Gastropoda 1 <min 1 <min 1 <min Chironomidae (Larvae) 1 <min 1 <min 5 <min 4 0.01 3 <min 7 <min 2 <min 1 <min Trichoptera 1 0.02 Diptera (Pupae) 1 <min 2 <min Diptera 1 <min 1 <min 1 <min 13 <min 1 <min 1 <min Crangon 40 2.87 53 4.2 18 1.4 2 0.05 Palaemonetes pugio 1 0.25 Callinectes sapidus 1 0.01 Decapoda 3 0.09 Gammarus 39 0.14 115 0.5 289 1.03 167 0.61 455 1.81 150 0.62 467 2.02 33 0.06 Cumacea 4 <min Neomysis 37 0.18 4 0.02 5 <min 7 0.02 14 0.05 Isopoda 1 0.01 3 0.02 7 0.01 10 0.01 4 0.02 14 0.03 2 <min 14 0.05 1 <min Amphipoda 4 <min 15 0.01 84 0.09 220 0.35 429 0.55 1 <min 12 0.01 11 0.05 Copepoda 1 <min 1 <min 1 <min 7 <min Polychaeta 1 <min 3 0.11 Fish scales 1 <min 2 0.04 October Unid. fish 3 0.25 3 0.08 2 0.11 Gobiidae 1 0.22 Sciaenidae 2 0.11 2 0.09 Pelecypoda 1 <min 1 <min 3 <min 3 0.02 Chironomidae (Larvae) 4 <min 1 <min 7 <min 2 <min 4 <min 2 <min 1 <min 1 <min Trichoptera 2 0.02 Crangon 20 1.23 68 9.78 25 1.59 11 1.89 21 3.12 1 0.2 2 0.1 Palaemonetes pugio 1 1.1 2 0.18 2 1.08 NOTE: All weights are in grams. For some food items, weights were less than the minimum weight measurable by instrumentation and are represented here as < min.

TABLE F-4 (CONTINUED)

Croton-Battery Yonkers Tappan Zee Indian Point West Point Cornwall Poughkeepsie Hyde Park Kingston Saugerties Catskill Albany Haverstraw Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt. Ct. Wt.

October (cont.)

Callinectes sapidus 2 0.02 1 0.04 Rhithropanopeus harrisii 1 0.03 1 0.11 Decapoda 1 0.08 2 0.08 Gammarus 22 0.14 58 0.5 75 0.4 821 3.98 757 4.78 86 0.55 398 1.90 920 4.77 592 3.07 274 1.01 Neomysis 3 0.02 15 0.1 5 0.02 6 0.03 82 0.61 Isopoda 5 0.14 12 0.11 7 0.04 11 0.14 1 <min 3 <min 10 0.02 5 0.07 4 0.07 10 0.11 5 0.05 Amphipoda 1 <min 36 <min 525 0.8 188 0.43 364 0.56 10 <min 1 <min Copepoda 3 <min 1 <min Polychaeta 5 0.06 1 0.07 1 0.03 Fish scales 1 <min November Empty stomach 1 1 Unid. fish 1 0.06 1 0.04 Micropogonias undulatus 6 0.55 1 0.1 Gobiidae 1 0.16 Pelecypoda 3 <min Gastropoda 1 <min Chironomidae (Larvae) 3 <min 5 <min 6 0.02 1 <min 8 0.01 Insecta 1 <min Crangon 41 10.85 7 2.14 20 3.68 7 1.3 15 5.97 2 0.42 Palaemonetes pugio 1 0.53 9 2.67 8 5.24 Callinectes sapidus 2 0.27 1 0.03 1 0.05 1 0.12 Rhithropanopeus harrisii 1 0.01 Malacostraca 7 <min 1 0.1 11 0.02 2 0.01 22 0.54 1 0.01 3 0.02 Gammarus 58 0.2 142 0.72 467 1.67 327 1.79 574 2.6 1873 7.77 180 0.96 510 2.59 1351 7.41 Cumacea 11 0.04 Neomysis 2 0.03 60 0.25 59 0.24 30 0.16 Isopoda 1 0.02 1 <min 12 0.06 1 <min 5 0.08 29 0.34 4 0.03 6 0.09 6 0.07 Amphipoda 1 <min 13 0.02 43 0.07 62 0.06 Copepoda 1 <min 1 0.01 3 <min Oligochaeta 1 0.03 1 0.08 NOTE: All weights are in grams. For some food items, weights were less than the minimum weight measurable by instrumentation and are represented here as < min.